ABOUT

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• Scientific employees
• Employees who worked
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• Gender Equality Plan
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• Committee on meteorites
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• Contacts

PERIODICALS

• Геохімія та рудоутворення
• Мінералогічний журнал
• Записки Українського мінералогічного товариства

INFORMATIONAL
MESSAGES

• Exhibition
• Defense of dissertation
• Conference
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• Director elections
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• Solemn meeting of the Academic Council
• Popularization in mass media
• Lecture, seminar

HORIZON EUROPE

Laboratory of isotope geology

Department of Radiogeochronology

Responsible person:

Stepaniuk Leonid Mykhailovych, phone (044) 424-15-70, stepaniuk@nas.gov.ua

 

      Research to determine the timing of geological processes and the formation of rocks, minerals and ores is carried out using uranium-lead, rubidium-strontium and samarium-neodymium isotopic methods.

        Dating U-Pb by the isotopic method  are performed on accessory uranium-containing minerals (zircon, monazite, uraninite, nasturan, allanite, sphene, etc.). The weight of the sample, depending on the uranium content, ranges from several micrograms (uraninite) to several milligrams (zircon, allanite, sphene). Galena or another mineral that does not contain uranium can be used to determine the model age of lead ore. Crystals of dateable minerals are selected by hand under binoculars.

      Age determination Rb-Sr isotope method  are carried out, depending on the task, on a series of samples of gross samples of cogenetic rocks, or on minerals of one sample. Chemical preparation is performed for samples ground into powder. The primary ⁸⁷Sr/⁸⁶Sr ratio can be calculated as the intersection of the (⁸⁷Sr/⁸⁶Sr) isochron , constructed from a series of samples of gross samples of cogenetic rocks, or from minerals of one sample. This ratio can be determined by direct measurement of the isotopic composition of strontium in apatite or plagioclase. In the latter case, a correction is introduced for the radiogenic addition of the isotope ⁸⁷Sr, according to the ratio ⁸⁷Rb/⁸⁶Sr.

        Research using the Sm-Nd isotopic method is carried out according to gross rock samples. Model ages can be calculated from CHUR and DM as well as ε_Nd for individual samples, provided the time of rock formation is known. From a series of samples of gross samples of cogenetic rocks or from minerals of one sample, the age can be determined by the slope of the isochron, and the ¹⁴³Nd/¹⁴⁴Nd isochron axis can be used to calculate &epsilon _Nd. Chemical preparation is performed for samples (rock, mineral) ground into powder.

Methodology

Methodological recommendations for uranium-lead, rubidium-strontium and samarium-neodymium isotopic dating of geological objects at the GRR. Methodological recommendations / Dovbush T.I., Skobelev V.M., Stepaniuk L.M. – K.: UkrDGRI, 2008. – 77 p.

 

 

Chemically clean (dust-free) room.

Responsible persons:

Dovbush Tetyana Illivna; Kotvitska Iryna Mykolaivna

 

        Chemical preparation of geochronological samples is performed using ion-exchange chromatography, according to the "Methodological recommendations for uranium-lead, rubidium-strontium, and samarium-neodymium isotopic dating of geological objects at the GRR" method. Methodical recommendations» (T.I. Dovbush, V.M. Skobelev, L.M. Stepaniuk – K.: UkrDGRI, 2008. – 77 p.).